A truly overunity Transformer / Meg

[gyulasun]

Well I wonder of someone can answer this, but here goes:
Why does Ivanov use half wave ac and not just full wave ac..? I mean it is the saturation level that counts and so the polarity of the field should/does not matter. So why the half wave ac?

Regards,
Steven

Hi Steven,

I have also pondered on this question.  I think if you use full wave AC, then core saturation can occur twice within one full cycle so frequency doubling takes place in the output waveform, 100Hz out for a 50Hz input.

Of course you have to take care of the DC excitation received from the half wave rectification because it surely biases the input core to a certain direction on the B/H curve.

rgds,  Gyula

[Kator01]

Hello Steven,

good question. I once had observed a weird effect when I loaded the primary of a step-down ring-transformer
( 230 V -> 12 Volt , 100 Watt ) with a halfwave, as this is shown in the hand-drawing above . Since I am a cautious person I put in series behind the diode a 230 V incandescant-bulb ( 30 Watt ). Now without diode the free wheeling transformer ( no load attached to the secondary) usually consumes just 0.7 watt and the bulb is dark.
But with diode the bulb was fully lit and the ring-transformer was humming and vibrating very loud with 50 Hz.

I stopped this experiment because at that time I thought it does not make sense to have that much of energy lost already at the primary with no load. Now the problem was that my watt-meter ( I bought this from a professional electronic-company here in germany) was showing more than 30 Watt input, so I knew then that it was reading false values.

You can try this yourself. I think something weird is happening with the Kick-Back-EMF after each halfe-wave which is not synchronized with the grid-frequency. If the kick-back-emf arrises it feeds back into the grid at the time the negative-part of the sinus-wave of the grid is on thus it is a grid-controlled back-feeding of the Kick-Back-EMF with no diode.
I now must repeat this experiment and find out more.

When I say Kick-Back-EMF then I do not refer to Back-EMF - this is something different.

In order to give you an impression of this  Kick-Back-EMF - especially in ring-transformers - you do the following experiment :

You take a transformer ( ring-trafo or a usual trafo of bigger size - at least 100 Watt ) measure with a analoge-Ohm-Meter  the primary until the scaler has reached his final position. Then - and you have to do this very quick in about 2 seconds  - you disconnect the probes and measure again but this time with changed probe- position on the leads. Tell me what you see.


Regards

Kator

[Kator01]

Hi Getca,

can you please tell us what coretype is the bypass and basic loop by naming it in you pic MEG_1.1.jpg.

Thanks

Kator

[Getca]

Hello Steven...
The air gaps are between 0,5 and 1.5mm and it depends on the frequency and output power. About the measurement I use the basic theory like this http://www.opamp-electronics.com/tutorials/measurements_of_ac_magnitude_2_01_03.htm for AC output sinusoidal voltage and DC meter for the input DC voltage and current.
Why Mr Ivanov uses a half wave AC...I think because it's the simple way to drive the control coils and get back the magnetic energy via only one power diode. If he uses a push-pull magnetic sheme he just drives the control coils by the (+) and (-) half waves of AC input voltage. Of cource it's only my asumption...

Regards...
Rossen

[Getca]

Hello Kator...
Nothing special about the cores. The main core E shaped, 12x15mm middle section, Al~200. The shunt core E 20/6, 6x6mm middle section, Al~1300. The cores working fracuency is under 100kHz. It was my early experiment, but it demonstrates a working principle of a magnetic flux switching using magnetic bypass with a core saturation.

Best wishes...
Rossen